Portable bending brake



May 30, 1939. F. PETERS 2,1605441 l YORTABLE SEEDING BRAKE Filed May 24, 1957 ssheetssheet 1 N| f NN W m 8 3 W w .\.N N Q \Nw P f f d e We w mm w m F /NmJ Y WN M QN MN... @vis uw U lllllllll Inh" ilfl l! JMIIIIIJIUHYIL l||||||l|l|H||||l|l||lll lill/ll QW wm. 11111111 Il l mv May 30, 1939.

F. PETERS' PDBTABLE BENDING BRAKE .Filed May 24' 1937 3 Sheets-Sheet 2 gmwm, Wed Zeevs May 30, 1939. F PETERS 2,160,441

PORTABLE BENDING simu:

Filed May 24, 1957 3 Sheets-She'e't 3 a sg Patented May 30, 1939 UTED STATES PATENT OFFICE 4 Claims.

This invention aims to provide a simple but effective means for forming conduits of rectangular cross section, for fashioning the parts of the seam in such conduits, and to supply novel means for closing the seams.

It is within the province of the disclosure to improve generally and to `enhance the utility of devices of that type to which the present invention appertains,

With the above and other objects in View, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawings:

Fig. l shows in front elevation, a machine constructed in accordance with the invention;

Fig. 2 is ,a rear elevation;

Fig. 3 is a top plan wherein parts are broken away;

Fig. 4 is a transverse section;

Fig. 5 is a transverse section showing certain parts as they will appear before the metal that constitutes the conduit is operated upon to form the seam;

Fig. 6 is a transverse section similar to Fig. 5, but showing the parts as they will appear after the parts that form the seam have been completed;

Fig. '7 is a transverse section disclosing the parts as they will appear during the operation of flattening down the seam and closing it.

In carrying out the invention, there is provided a support, including parallel feet I, to which the lower ends of legs 2 are secured. 1nclined braces 3 connect the feet i with the legs 2. 'I'he numeral 4 marks a bed rail, which is an angle member, the bed rail comprising a vertical depending flange .and a horizontal rearwardly extended flange. Securing elements 5 connect the upper ends of the legs 2 with the depending flange of the bed rail 4. Inclined braces 6 are secured to the depending ange of the bed rail 4 and to the legs 2. One end of the bed rail 4 projects, as shown at I, beyond the corresponding leg 2, and has a notch or seat 8.

In the notch or seat 8 is removably mounted a pivot element 9, on which a supporting lever I0 is fulcrumed intermediate its ends. 'Ihe numeral designates a pull spring, one end of which is engaged at I2 with one of the braces 6, the opposite end of the pull spring II carrying a hook I4 engaged detachably in a hole I5 in the lower end of the supporting lever l0.

The upper end of the supporting lever Ill is 5 pivoted at I6 to a clamp I'I, which is an angle member, comprising a vertical upstanding flange and horizontal flange. The horizontal flange of the clamp Il is disposed above the horizontal ange of the bed rail 4, and the Vertical flange 10 of the clamp vI'I is in the same plane with the depending flange of the bed rail 4, as Fig. 5 will show. The rear edge of the horizontal flange of the clampv I'I is beveled to form an acutely angular portion |00, as Figs. 5 and 6 will show.

That end oi the clamp I l which is remote from the supporting lever I0 is pivoted at I8 to an upwardly extended angular operating lever I9, fulcrumed at its lower end, at 20, on the depending ilange of the said rail 4. The upper 20 end of a link 2| is pivoted to the outer end of the operating lever I9, and the lower end of the link is pivoted to the intermediate portion of a transversely extending pedal 22 having its rear end pivotally mounted as at 23 on one of the V25 braces 3. A guide strip 26 is secured (Fig. 1) to one of the feet I and to one of the legs 2, in spaced relation to the leg, and the pedal 22 has vertical movement between the guide strip 28 and the said leg. 'Ihe upper end of a pull 30 spring r24 is secured to the bed rail 4 by means of one of the attaching elements 5 and by means of a connection 25. The lower end of the spring 24is connected to the pedal 22, in front of the link 2|, as Fig. 4 will make manifest. 35

Securing elements 2l connect vertical bearing pieces 28 with the depending flange of the bed rail 4, and are located at the front side of the machine. The upper ends of the bearing pieces 28 extend upwardly above the level of the horizontal ange of the bed rail 4, to form guides 29.

In the bearing pieces 28 are jaurnaled short shafts 30, secured to the ends of a first bender 3|, which is an angle member, the first bender comprising a vertical depending flange lying against the depending flange of the bed rail 4, and a horizontal, forwardly presented Iiange, as disclosed in Figs. 5, 6 and '7. A handle 32 is hinged at 33 to the rst bender 3| for swinging movement in the direction of the length of the first bender 3|, but the construction is such that the handle 32 cannot swing in a direction at right .angles to the length of the first bender 3|. The handle 32 has a downward slope, as disclosed in Fig. 4, and is located conveniently near to the 55 pedal 22, the construction being such that when a person puts his foot on the pedal 22 he can lay hold of the handle 32 conveniently and swing the first member 3| .about a horizontal axis represented by the short shafts 30. Because the handle 32 has a lateral swinging movement, it may be so positioned that it can be used conveniently by an operator whilst his foot is on the outer end of the pedal 22.

Bearing structures are provided, and each includes an inner angle bracket 34 and an outer angle bracket 35 are held by each of the securing elements 21 in the angle formed by the horizontal and vertical flanges of the bed rail 4. The inner angle bracket 34 of each pair has a guide -36 which extends upwardly above the upper surface of the horizontal iiange of the bed rail 4, as Fig. 5 will disclose. At its rear end, the outer angle bracket 35 of each pair is provided with a -U- shaped bearing 31.

The numeral 38 marks a second bender, which is a tee member. In one of the angles of the second bender 38 is secured a shaft 39, in the form of a rod, mounted to rotate in the bearings 31 on the outer brackets 35. One end of the shaft 39 is formed into a rectangularly disposed handle 40,- whereby the second bender 38 may be turned about a horizontal axis represented by the shaft 39. The handle 40 is located at one end of the second bender 38. To the main flange of the second bender 38 is secured a rectangular strip or pressure member 4I, and the slope of the outer surface 42 of the strip or pressure member 4| is parallel to the slope of the angular portion |00 of the clamp I1, an observation which will be understood readily when Fig. 6 of the drawings is examined.

Referring to Fig. 2, the clamp I1 is spaced vertically from the bed rail 4. The sheet 43 of metal (Fig. 5) out of which the conduit 44 of Fig. 7 is to be formed, is slid forwardly from the back of the machine, on top of the horizontal flange of the bed rail 4, and beneath the horizontal ange of the clamp I1. The clamp I1 then is brought down on the sheet 43 of metal, along the guides 29-29 and 36-36 through the instrumentality of the pedal 22, Vthe link 2|, and the lever I9. The sheet 43 of metal lies between the guides 29-29 and 36-3G, and these guides also aid 'in holding the clamp I1 in place, as the clamp is brought down on the horizontal flange of the bed rail 4, all of which will be understood when Fig. 5 of the drawings is noted.

Whilst the sheet 43 of metal is held by the clamp I1, asV in Fig; 5, the first bender 3| is swung upwardly to the dotted line position of Fig. 5, by means of the handle 32. The edge of the sheet 43 which overhangs the horizontal flange of the first bender 3| is turned up against the vertical upstanding flange of the clamp I1, to Aform a right angle.

The sheet of metal is reversed edge for edge, and the right angle formed as above described is placed against the angular portion |00 of the clamp I1, the clamp being again brought down on the sheet of metal.

The second bender 38 is swung, by means of the handle 40, about a horizontal axis represented by yangular part is formed in the other edge ofthe sheet. The acutely angular portions 45 of the sheet are hooked together, as shown in Fig. 7, a part of the conduit being supported on the horizontal flange of the rst bender 3|, as in Fig. 7. The clamp I1 is brought down again, to close the parts 45 of the conduit together, thereby making a tight seam.

It will be understood that the angles 46 at the corners of the conduit 44 are formed by rocking the first bender 3| upwardly from the position of Fig. 5.

The conduit 44 is completed as to cross sectional contour, before the seam formed by the interengaged parts 45 is flattened down, and in order that the conduit may be placed conveniently in the machine, the hook I4 of Fig. 1 is cast off from the lower end of the supporting lever I0, the lever I0 is swung on its pivotal mounting I6, to carry the pivot element 9 out of the notch 8 in the bed rail 4, and the clamp |1 then may be swung upwardly to the dotted line position of Fig. 1, to facilitate the Vmounting of the conduit in the machine.

The device forming the subject matter of this application is simple in construction, but it affords a convenient and effective means whereby a conduit of rectangular cross section may be formed, and whereby the seam in such a conduit may be made and closed.

Having thus described the invention, what is claimed is:

1. In a machine of the class described, a support including a base, a clamp cooperating with the base, mechanism for moving the clamp toward and from the base, said mechanism comprising a vertically-movable pedal fulcrumed on the support, a Vbender mounted to rock on the support and cooperating with the base to bend a piece of metal whilst the piece of metal is held by the clamp, and a handle hinged to the bender for swinging movement toward and away from the pedal in a directionrtransverse to the direction in which the pedal operates, the handle being located close enough to the pedal so that an operator can lay vhold of the handle whilst his foot is on the pedal.

2. In a machine of the class described, a support including a base, a. clamp cooperating with the base, an operating lever fulcrumed on the support, one end of the clamp being pivoted to the operating lever, a supporting lever pivoted at one end to the opposite end of the clamp, the levers constituting means for moving the clamp toward'and away from the base when the operating lever is actuated, a pin and open slot structure fuicruming the holding lever intermediate its ends on the support, spring means connected to the support and to the lower end of the holdinglever and maintaining the pin and open slot structure in fulcruming position, the spring means permitting movement of the holding lever to Afree the 'same from the support, anda bender mounted to rock on the support iand acting on metal held by the clamp and the ase.

3. In a metal bending machine, a support including a base in the form of an angle member, a movable clamp cooperating with the base, spaced bearing structures comprising superposed inner and outer angle brackets secured in the angle of the angle member, and a bearing on the outer angle member; 'a bender mounted to rock in the bearing and constituting means for bending metal upon the base whilst the metal is held between the clamp and the base, the inner angle brackets being extended upwardly with respect to the base, to form guides, the metal being received between the guides for operation upon by the bender and the bender moving along the guides, toward the base during the bending operation.

4. In a metal bending machine, a support including a base, a clamp disposed above the base and having an acute bending portion, means for moving the clamp from a single point of force application, external to the clamp, toward and away from the base and longitudinally of the base, spaced bearing structures connected to one side of the support, the space between the bearing structures and between the clamp and the base being open to receive metal up to a width equal to the distance between the bearing structures, and a bender mounted to rock on the bearing structures and constituting mechanism for bending metal across said acute portion whilst the metal isgripped between the clamp and the base, the bearing structures each comprising an upstanding guide, the metal being received between the guides, for operation upon by the bender, one longitudinal edge of the clamp moving along the guides, toward the base, during the clamping operation, and the ends of the bender moving between the guides, in guided relation with respect thereto, during the bending operation.

FRED PETERS. 

